Just check shiningbeam and it looks like they have 2 Rominsens that are XM-L U2. Both under $29, rated at 750+ lumens, both 2 mode (high/low), and both look like they'd throw a beam out a ways. Link to the lower cost one.

So, if I go this route (quite possible), put the new one on the bars and then my current on either on the bars in blink or the helmet on probably medium.